Data coypright management method

• US 5,646,999 A
• Filed: 10/27/1995
• Issued: 07/08/1997
• Est. Priority Date: 10/27/1994
• Status: Expired due to Term

• Current Assignee: Piracy Protection LLC (LF Capital Partners, LLC)
• Original Assignee: Mitsubishi Corporation
• Inventors: Saito, Makoto
• Primary Examiner(s): Tarcza, Thomas H.
• Assistant Examiner(s): SAYADIAN, HRAYR
• Application Number:
  US08/549,271
• Time in Patent Office: 620 Days
• Field of Search: 380/4, 380/25, 380/21, 380/23
• US Class Current: 705/54
• CPC Class Codes: G06F 21/10 Protecting distributed programs or content, e.g. vending or licensing of copyrighted material protection in video systems or pay television H04N7/16 ; Digital rights management [DRM]
• CPC Class Codes: G06F 2211/007 Encryption, En-/decode, En-/decipher, En-/decypher, Scramble, (De-)compress
• CPC Class Codes: G06F 2211/008 Public Key, Asymmetric Key, Asymmetric Encryption
• CPC Class Codes: G06F 2221/2101 Auditing as a secondary aspect
• CPC Class Codes: G06F 2221/2117 User registration
• CPC Class Codes: H04L 2209/605 Copy protection
• CPC Class Codes: H04L 2463/101 applying security measures for digital rights management
• CPC Class Codes: H04L 63/0428 wherein the data content is protected, e.g. by encrypting or encapsulating the payload
• CPC Class Codes: H04L 63/0442 wherein the sending and receiving network entities apply asymmetric encryption, i.e. different keys for encryption and decryption cryptographic mechanisms or cryptographic arrangements for public-key encryption H04L9/30
• CPC Class Codes: H04L 63/0464 using hop-by-hop encryption, i.e. wherein an intermediate entity decrypts the information and re-encrypts it before forwarding it
• CPC Class Codes: H04L 63/061 for key exchange, e.g. in peer-to-peer networks cryptographic mechanisms or cryptographic arrangements for key agreement H04L9/0838
• CPC Class Codes: H04L 63/12 Applying verification of the received information cryptographic mechanisms or cryptographic arrangements for data integrity or data verification H04L9/32
• CPC Class Codes: H04L 63/126 the source of the received data
• CPC Class Codes: H04L 9/0825 using asymmetric-key encryption or public key infrastructure [PKI], e.g. key signature or public key certificates
• CPC Class Codes: H04L 9/083 involving central third party, e.g. key distribution center [KDC] or trusted third party [TTP]
• CPC Class Codes: H04L 9/3247 involving digital signatures
• CPC Class Codes: H04N 2005/91364 the video signal being scrambled
• CPC Class Codes: H04N 21/63345 by transmitting keys key distribution for secret or secure communication H04L9/08; network support of key management H04L63/06
• CPC Class Codes: H04N 5/913 for scrambling ; for copy protection
• CPC Class Codes: H04N 7/162 Authorising the user terminal, e.g. by paying; Registering the use of a subscription channel, e.g. billing

Abstract

The present invention provides a process for managing data copyright in the case when a primary user produces new data by editing a plurality of original data and supplies the new data to a secondary user. A public-key and a private-key of the primary user, and a first secret-key and a second secret-key of the original data, each of which is controlled by a copyright management center, and an edit program are used. The primary user, who is supplied a plurality of original data encrypted by each first secret-key thereof, decrypts the plurality of original data by each of the secret-keys and produces new data using the edit program. The primary user re-encrypts the new data by the second secret-key of each original data, respectively. The re-encrypted data is supplied to the secondary-user, together with editing process data which includes a digital signature generated using the private-key. The secondary user presents the editing process data with the digital signature to a copyright management center. The copyright management center confirms that the digital signature is of the primary user, and then, transmits the second secret-key for the respective original data. In the present data copyright management process, it is possible that the secondary user edits again the data which has been edited, by using the second secret-key in place of the first secret-key and using a third secret-key in place of the second secret-key.

Claims

1. A data copyright management method used for producing new data by editing original data, the method comprising the steps of:

a database supplies a plurality of original data encrypted respectively by using each first secret-key thereof, to a primary user;

said primary user makes a request for use to a copyright management center by presenting a public-key of said primary user;

said copyright management center sends said first secret-key of each of said original data and a second secret-key of each said original data to said primary user;

said primary user decrypts said plurality of original data encrypted, by using said first secret-key of each said original data;

said primary user produces new data which is produced from a plurality of edited data by editing said plurality of original data using an edit program;

said primary user encrypts said plurality of edited data respectively by said second secret-key of each said original data and performs a digital signature on editing process data of said edit program by using a private-key of said primary user, and supplies both said plurality of edited data and said editing process data with said digital signature to a secondary user;

said secondary user requests use of said new data by presenting said editing process data with said digital signature to said copyright management center;

said copyright management center confirms an editor as said primary user from said digital signature using said public-key of said primary user, and provides said secondary user with said second secret-key of each said original data; and

said secondary user decrypts said plurality of edited data which have been encrypted, respectively by using said second secret-key of each said original data, and obtains said new data using said edit program and said editing process data.

2. The data copyright management method according to claim 1, wherein secondary copyright of said primary user is registered when said secondary user presents said editing process data with said digital signature to said copyright management center.

3. The data copyright management method according to claim 2, wherein said secondary user presents said plurality of edited data together with said editing process data with said digital signature to said copyright management center when requesting use of said new data.

4. The data copyright management method according to claim 3, wherein said edited data comprises a whole of one or more of said plurality of original data.

5. The data copyright management method according to claim 4, wherein said first secret-key is changed to said second secret-key to be used, and said second secret-key is changed to third secret-key to be used so that said secondary user edits again said new data.

6. The data copyright management method according to claim 3, wherein said edited data comprises a part of one or more of said plurality of original data.

7. The data copyright management method according to claim 6, wherein said first secret-key is changed to said second secret-key to be used, and said second secret-key is changed to third secret-key to be used so that said secondary user edits again said new data.

8. The data copyright management method according to claim 3, wherein said first secret-key is changed to said second secret-key to be used, and said second secret-key is changed to third secret-key to be used so that said secondary user edits again said new data.

9. The data copyright management method according to claim 2, wherein said edited data comprises a whole of one or more of said plurality of original data.

10. The data copyright management method according to claim 9, wherein said first secret-key is changed to said second secret-key to be used, and said second secret-key is changed to third secret-key to be used so that said secondary user edits again said new data.

11. The data copyright management method according to claim 2, wherein said edited data comprises a part of one or more of said plurality of original data.

12. The data copyright management method according to claim 11, wherein said first secret-key is changed to said second secret-key to be used, and said second secret-key is changed to third secret-key to be used so that said secondary user edits again said new data.

13. The data copyright management method according to claim 2, wherein said first secret-key is changed to said second secret-key to be used, and said second secret-key is changed to third secret-key to be used so that said secondary user edits again said new data.

14. The data copyright management method according to claim 1, wherein said secondary user presents said plurality of edited data together with said editing process data with said digital signature to said copyright management center when requesting use of said new data.

15. The data copyright management method according to claim 14, wherein said edited data comprises a whole of one or more said plurality of original data.

16. The data copyright management method according to claim 15, wherein said first secret-key is changed to said second secret-key to be used, and said second secret-key is changed to third secret-key to be used so that said secondary user edits again said new data.

17. The data copyright management method according to claim 14, wherein said edited data comprises a part of one or more of said plurality of original data.

18. The data copyright management method according to claim 17, wherein said first secret-key is changed to said second secret-key to be used, and said second secret-key is changed to third secret-key to be used so that said secondary user edits again said new data.

19. The data copyright management method according to claim 14, wherein said first secret-key is changed to said second secret-key to be used, and said second secret-key is changed to third secret-key to be used so that said secondary user edits again said new data.

20. The data copyright management method according to claim 1, wherein said edited data comprises a whole of one or more of said plurality of original data.

21. The data copyright management method according to claim 20, wherein said first secret-key is changed to said second secret-key to be used, and said second secret-key is changed to third secret-key to be used so that said secondary user edits again said new data.

22. The data copyright management method according to claim 1, wherein said edited data comprises a part of one or more of said plurality of original data.

23. The data copyright management method according to claim 22, wherein said first secret-key is changed to said second secret-key to be used, and said second secret-key is changed to third secret-key to be used so that said secondary user edits again said new data.

24. The data copyright management method according to claim 1, wherein said first secret-key is changed to said second secret-key to be used, and said second secret-key is changed to third secret-key to be used so that said secondary user edits again said new data.